초록 ▼

The invention relates to a power door opener, such as the type of opener used for opening overhead garage doors includes a worm gear rod having a major thread and a carrier member coupled to the door and releasably engageable with the major thread for moving the door between open and closed position

The invention relates to a power door opener, such as the type of opener used for opening overhead garage doors includes a worm gear rod having a major thread and a carrier member coupled to the door and releasably engageable with the major thread for moving the door between open and closed positions as the rod rotates. A second thread whose pitch is smaller than the major thread is formed on the rod and on a portion thereof located between a pair of spaced apart limit switches. A control member threadably engages the second thread for movement between the limit switches as the rod rotates for terminating motor operation as the door moves into its open and closed positions. The carrier member is mounted for radial movement into and out of engagement with the major thread to permit manual operation of the door.

대표청구항 ▼

A door opener including elongate rod means having a major thread formed thereon, reversible motor means coupled to said rod for reversibly rotating said rod means about its longitudinal axis, carrier means adapted to be coupled to a door and cooperating with said major thread for longitudinal moveme

A door opener including elongate rod means having a major thread formed thereon, reversible motor means coupled to said rod for reversibly rotating said rod means about its longitudinal axis, carrier means adapted to be coupled to a door and cooperating with said major thread for longitudinal movement between first and second positions relative to said rod means in response to rotation thereof, a pair of spaced apart switch means disposed adjacent a portion of said rod means, the distance between said switch means being substantially shorter than that between said first and second positions, a second thread formed on at least that portion of said rod means between the positions of said switch means, a threaded switch activating member mounted on said rod means and engaging the second thread thereof for movement between said switch means in response to rotation of said rod means, means coupling said switch means to said motor means whereby activation of said switch means controls the energization of said motor, the pitch of said major thread being substantially greater than that of said second thread whereby said carrier means is moved by said motor means between its first and second positions as said actuating member travels between said switch means.